Twyer-grate for individual-gas-producer kilns



`J.. T. AND L. IVI. UNDERWOOD.

TWYER GRAIE FOR INDIVIDUAL GAS PRODUCER KILNS.

APPLICATION FILED FEB.. Is, 1920.

1,376,8413. y Patented. May 3,1921.

F557- EI-,

' 2 SHEETS-SHEET 2.

s'rarss raient' ferries.

JOHN UNDERWOOD AND'IJOIS iM. 'UNDERVOD,^OF DAYTOFL OI-IIC;

TwYEn-GRATE non iNnr-vinuiiL-Gns-PnonucnnKrimis;

To all whom t may cof/wem Be it known that we, JOHN-T. UNDERwooD andLois M. 'UNDERwooD, citizens o f the United States, residing at Dayton,in the--Y county of'Montgomeryand State of hio,

have invented certainnewandfuseful lm-V provements-in Twyer-Grates forIndividual- Gas-Producer Kilns, of-whichy the following is aspecification. r l l This invention relates I'to Anew and usefulimprovements in grates for furnaces and is designed primarily for use-with twyer grates forl furnaces of individual gas producer kilns. i v

More particularly, the invention relates to the construction of thetwyer grate, and means for removing the accumulations ,ofV

ashes therefrom.

One object of the invention is to provide means whereby thefashesfmay beremovedfrom a stationary grate, or fuel supporting structure,from-beneath' the burning fuel,l 'without displacing the fuel orseriously af-V fecting it other-than to permit it to settle down uponthe grate. v

A further object f of the invention is to provide,` in connection withVsuch anashesy removing device, lfa simple and highly i etlicient gratefor burning coal forthepurpose of producing gas.

Other objects ofl the invention may appear as the'device is described indetail.

Referring `to the said-drawings in? general terms, Figure 1 is a frontelevation of a portion of a kiln showing the furnace. Fig. 2 is avertical sectional elevation of the furnace ofv an individual gasproducer kiln, parts being broken away toY economizespace.' lFig.

3 lis -a topplanview of the grate removed from the furnace. Fig.y 4 is asectional viewon'the line of Fig.-3. 'Fig. 5 is a crossV sectional view:on the1line*-5- 5- `of Fig. 3. Fig. 6 is aside elevation ofrthe'frontend 'of the grate showing the. operating 'lever by which ,the" a .ash aremoversare Yoperated,

' Y and Fig.` 7.is anenlargedsectional view of a portion of the 2 front'end ofthe grate, lon the line '-f-"-f-'- of. Fig.I showing a part ofthe'airands'teanifl inletfpipe.

In these'. drawingsxwefhave illustrated onel embodimentwof ourinvention-and have shown the same as applied toa furnace 'gas' iproducerAll and -as comprising. a stationary grate; Vor I fuelsupporting; structure, which is provided, preferably, :with oneJ orlmore' twyers andf'wlth means for forcing-a cur`i` Specification ofLettersPatent;v

rent of air through the twyers int-o the Patented'May 3, 1921.2k

ApplicationI iled vFebruary Y18, 1920, 1. Seal Nm l 359564K mass of fuelresting uponjthegratelL nMounted for movement over the uppersurface ofthe fuel supporting structure, alongsidethe twyer or twyers, is an ashesremovingk de-` vice of such a character that .it will kmove the ashesfrom beneath the mass of burning fuel toward one end ofthe grate andthere vdischarge-the same without seriously aifect ing the mass ofburningfuel. 4It will fbe un'-l derstood that 'the invention may,takeva-v Y rious forms and may/be utilized with furnaces of variouskinds .withoutwdeparting from the spirit thereof, and, therefore, thatthe particular embodiment `here illustrated Y has been chosen for thepurposes of illustration only.

In a more particularA descriptionVIV ofthe inventionv similar. referencenumerals will be employed to indicate the samepartsin the several viewsof the drawings. -l-

designates the furnace of an individual` gasv producer kiln, and 2- isthe bag-wallof said kiln. The-furnace le is a par-t ofthe kilnconstruction and each kiln of a series is provided in the structurethereof, with its. e 'own individual gas producer furnace or` chamber. pv

The *subject-matter of the jpresent improvements `consists ofk aremovable twyer grate which is especially constructed yto .pro-

videv the necessary producer gas yfor burn-` -ing the kiln, after whichsaid grate may be vremoved to the individualfurnace of an- -,-5--projecting from -:the v opposite side walls of the furnace. Vhen thispan -3-.

is supported on.V said ledges -5--,asshown.

fin Fig. 1, the spacef-Gfwhich'is'usually termed anash-pit, lies below,but the .ashes do-not enter this space; Means" forL removi ingsaid-ashes fromfth'e grate inthe fronty Y l of the furnace are providedas follows: The pan-3-- is imperforate and supportedV thereon andthereabove .is :a twyeraplate T-'which constitutes theupper part, .orf-

twyers k-8- eXtendin -fuelsupporting surface, of the grate and y which'has, 'inthe' presenty instance, .two` substantially. the

iio

ing the twyers -8'- is rigidlyxsecured tofA twyers may be increased byincreasing the area of the said plate 7 as well as that of the pan 3 Inthe present instance the twyers comprise openings, or slots, formed inthe plate 7 and having upwardly converging ianges arranged on both sidesthereof. Immediately above the said twyers 8 are longitudinal bars 9curved transversely Vand united to the ends of the twyer plate 7 Thesebars 9 or cover plates, as they may be properly termed, provide acertain space above the twyers for'the air and steam to pass into thebody of Coal lying upon the grate and from which the producer gas isgenerated. The grate, it will be understood, consists of the pan 3 thetwyers 8 and the cover plates 9 the latter being united to the twyerplate -at both ends l0 In the present form of the invention the ashesremovers consist of endless chains l,l which are arranged parallel withthe twyers and therebetween and on each side thereof and rest'on thetwyer plate 7 These endless chains 11- pass over sprocket wheels 12- and18 the former being Y on the outside of the front of the furnace1 andthe wheels 13 being within a pocket 14 in the back of the furnace ormore properly speaking, in the bag-wall 2 The inner wheels 13 aremounted upon a shaft l5 which is supported in bearings 16- cn theinnerends of the flanges 4 of the pan 3 or in any suitable Way. Theinner wheels 13 may be either sprocket wheels as shown, or groovedpulleys.' The outer wheels 12 are necessarily chain wheels as they drivethe chains ll through the spaces between the twyers and alongsidethereof. The front sprocket wheels 12 are rigidly mounted upon a shaft17 which is likewise mounted in the forward ends of the flanges -lf-f ofthe pan 3 It will be understood that there are two sprocket wheels 12 13for each chain. The said chains 11 or rather ysome of the links thereof,have projected from them hooks 18 which serve to break up any clinkersthat may lie in the path of the movin chains when operated to remove theashes rom the grate. These hooks 18 as shown,

thereof may be employed as may be found necessary. At the'front end ofthe grate the pan has a suitable opening 19 into which a lsteam and airpipe 20 is projected and 'byA means of which steam and air are injectedinto said pan 3 below the twyers. On the end of the front shaftV claimpro-v ject from every fourth link of the chain and l7 a ratchet wheel 2l-is secured, and loosely mounted on said shaft, adjacent to said ratchetwheel, is an operating lever 22 the said lever having a pawlA 23 the endof which is adapted to engage the ratchet wheel 21 to move the shaft 17The double acting pawl 23 is pivoted at 2l to the operating lever Q2-and has a tapered projection 25 projecting from the middle portionthereof. This tapered projection 25 engages a tapered end 26 of ayplunger 27 which is supported on the lever 22 and is pressed toward thetapered projection 25 of the pawl 23- by acoi'l spring 28 This plunger27 holdsthe pawl 23 in either position.- When it is desired to reversethe movement of the chains 1l the pawl 23 is moved byr hand chains aresimultaneously operated.

The front of the furnace has'a door 30 whichcloses the upper part of thefurnace only, and leaves the lower part exposed so that the grate maybeoperated at will to remove the ashes from lthe twyer grate.

lhie we have shown and described one embodiment of our invention. wewish it to be understood that .wey do not desire to be 'limited to thevdetails thereof as various modifications may occur to a person skilledin the art. i j

Having described our invention, we

ll. In a device of the character` described,

lll)

a stationary fuel support, and an ashes re- Y moving device mounted formovement over said fuel support beneath the burning -fuel thereon, andmeans for actuating said ashes one edge of said fuel support.

iisV Vremoving device to move the ashestoward j c face of said fuelsupport and' beneath the I burning fuel supported thereby, andmeans foractuating said conveyerV to move the ashes from beneath the fueltowardone edge l of said support.

3.-In a device of the character described, a stationarj fuel supporthaving a twyer extending longitudinally thereof, means to force acurrentof air through said twyer,

said fuel support being arranged to permit ashes to be discharged at oneend thereof, ashes removing devices mounted on opposite sides of saidtwyer for movement over the upper surface of said stationary fuelsupport, and means for actuating said devices to move the ashes frombeneath the vburning fuel toward the discharge end of said fuel support.

4. In a device of the character described, a stationary fuel supporthaving a twyer extending longitudinally thereof, means to force acurrent of air through said twyer, said fuel support being arranged topermit ashes to be discharged at one end thereof, endless conveyersextending about ksaid fuel support in the direction of its length andhaving their upper stretches arranged to move overrthe upper surface ofsaid fuel support on the respective sides of said twyer to move theashes from beneath the fuel toward the discharge end of said fuelsupport, s

with a twyer, means for forcing a current of a'ir through saidstructure' and'said twyer, and ashes removing devices mounted formovement over said fuel supporting part parallel with and on oppositesides of said twyer, and means for actuating said ashes removing devicesto cause the ashes to be moved from beneath the burning fuel toward oneend of said hollow structure.

6. In a device of the character described, a stationary pan, a fuelsupporting plate rigidly secured-to said pan and having twyer openingsextending longitudinally thereof, covers extending over said twyeropenings, chains arranged to travel through the spaces between adjacenttwyer o enings and lengthwise thereof to remove t e ashes from saidvfuel supporting plate, and means for driving said chains.

In a device of the character described, a fuel supporting structurecomprising a pan-shaped plate having its concave side pan-shaped plateand provided with twyer openings, said pan-shaped plate having anlopening in one wall thereof, an injector extending into said opening,chains movable over the upper surface of said second plate alongside ofsaid twyer openings, wheels supporting said chains and arranged at theends of .said structure, and means for simultaneously actuating thewheels at one end of said structure.

8. In a device of the character described, a fuel vsupporting structurecomprising a pan-shaped plate having its concave side upward and havingmarginal flanges adapted to be supported Vby the walls of a' furnace, asecond plate mounted on the first mentioned plate and provided withtwyer openings, an injector communicating with said pan-shaped plate,endless chains mounted for movement over the upper surface of saidv lastmentioned plate alongside of said twyer openings, and having projectionsthereon, and means for actuating said chains.

9. In avdevice of the character described, a fuel supporting structurecomprising a pan-shaped plate having its concave side upward and havingmarginal flanges to rest upon the side walls of the furnace, a second Yplate mounted on the first mentioned plate and having twyer openingstherein, bars lying abovesaid twyer` openings to form covers therefor,an injector communicating with the interior of said pan-shaped platebeneath said second plate, endless chains adapted to travel over theupper surface of said second; plate alongside of said twyer openings,said chains having projections eX- tending therefrom, said pan-shapedplate having bearings at the respective ends thereof, shafts journaledin said bearings,

' wheels mounted Von said shafts to support .said chains, and means forrotating one of said shafts to drive said chains.

In testimony whereof'we affix our signatures. Y

JOHN T. UNDERWOOD. LOIS M. UNDERWOOD.

